William a



Patented Ja n. 31, 1 893.

(No Model? W A GRAY VALVE FOR PNEUMATIC TIRES.

WiLLiAM A. GRAY, or. ELIZAB sis, NEW I JERSEY; ASSIGNOR To HIMSELF,

snitch;

t niest AND EDWARD RyijitwoLFfi, on NEW roan, N.

carve-Eon Pneumatic rises.

srnoxrrcs'rrou forming art of Eliett-ers Eatent No. silo ace, dated January e1, 1893.

- Application filedhplil 18, 1892- Serial do. 4291656 lla model.l.'

I To aIZZ whom it? may concern.-

Be it known that 1, WILLIAM A .GR. ;Y, a

citizen of the United States, residing at Elizabet-h, in the county of Union andState oi New Jersey, have-invented a new and useful Improvement in Valves for Pneumatic Cycle- Tires, of which the following is a specification.

My invention is designed as an improvemerit upon the. device shown and claimed in the patent granted to E. R. DeWolfe October 6,'1-'891,-No. 460,714, the obj ect of my invention being to simplify the construction and lessen [and a tubularcylindrical containing case, an elasticseptnm perforated for permitting the perforated centrally at 3.

entrance of air and which closes automatically tcprevent its escape, suchseptum being hollow and hemispheroidal seated and held in place within and between the parts of the eylindr'i cal case.

In the drawings Figure 1 represents a cross section of an inflatable orh-ollow expansible rubber tube and a cross section of my improved valve; and Fig. .2 represents by a plan view the elastic septum. These figures .are. of exaggerated-size for clearncss.

a represents the inflatable or hollow expansible tube of rubber. This is the inner air tuo'of the pneumatic tire, the other parts of the'tire and the rim of the wheel not be ing shown in thedrawings because they are of well-known form and do not require illus-.

tration or description.

i) represents the tubular cylindrical case of metal having a disk 19' or'ilanged base which ismoldcd into the rubber composing the expansible tube a. 'lhe upper end of the cylindrical case b is slightly reduced and threaded at 2. 0 represents the-cylindrical head The lower portion of this head is tubular and. internally thread ed and screws upon the cylindrical case b, the edges of the metal meeting and forming a tight joint at 4, and the periphery of this head 0 is knurled at 5 so that it maybe readily turned by the fingers. The upper end of the cylindrical head is threaded and provid ed with a shoulder at S and an imperferate cap d screws upon the head down to a tight joint at the shoulder-.8 completely shutting out water or dust fro. uthB valve.' This" cap is also knurled upon the outer surface at 6 nothat it may be readily "turned by the fin gate;- It-hie cap 0? might be dispensed with or any equivalent device employed. v

The elastic device, for permitting the en.-

trance of airbut closing automatically to prevent its escape, consists of a septumof soft rubber having a base e and a perforated hollow hemispheroidal or dome-shaped center c which are moldedtogetheras one piece. The basee fits Within the'cylindrical portion of the perforated head 0 and rests against the inner face of said head at 7,'the other surface of y the ring resting against the end of the tub'ularcase b, and when the head 0 is screwed upon the case b the base'e is, clamped and slightly spread into the screw. threads and held firmly in place, the hollow hemispheroidal center as having its apex next to the hollow expansible tube a. The-rubber is prei erably perforated"- by thrusting a sharp pointed instrument through thehcmispheroidal portion.

It willbe readily understood that in'ordexg,

to inflate-the tube a the cap dis removed and an air pump is eitherconnecte'd direct or by its coupling upmi the cylindrical head 0,-an'd the air is forced through the perforation 3'of said head, expanding the he nispheroidalcenterand stretching the rubber and enlarg:

ing the perforation in'the hemispheroidal center c from within andopenin-g its center sufficiently for the'air to enter within the tube a. Afterthe tuce suliiciently iniiate'd and.

'the pressure of the air pump removed, the

rubber contracts and the pressure of air within the tube a effectually closes the pertorati'on in the rubberhemispheroidal septnm prev enting the escape 0 air, and the greater-the pressure of air wit in".the tube a,

the more tightly said hemispheroidal center is closed by compression. as the pressure tends to flatten the dome but the boundaries of the rubber being limited the hemispheroidal center is flattened but little.

The construction of the parts is such that he walls of tho-hemispheroidal. center taken together greatly exceed the opening through the base. e and it is therefore impossible for the pressure to invert the parts or the confined air to escape, Air may be released from this hollow inflatable tube at either by removing the cap 01 and head 0 or by inserting downwardly through the hemispheroidal center a fine tube which allows the tire to be deflated.

I do not herein claim the tubular cylindrical case or any part thereof.

I claim as my invention.

1. The combination with the tubular, case b. and the perforated tubular heads screwing upon the case b.,-of the hollow hemispheroidal perforated septum of rubber having a base held between the head 0 and the end of the case b substantially as set forth.

'2. The combination with the inflatable or I hollow expansible tube a, the tubular cylindrieal ease I) and its disk I) molded into the tube 0,, of the perforated and tubular cylindrieal head 0 screwing upon the cylindrical case b, the soft rubber septum having abase e and perforated hollow hemispheroidal eei1- ter e, the base 6 being seated and held between the upper end of the cylindrical easel) and the inner surface of the cylindrical head a with the apex of the hemispheroidal center toward the tube a, substantially as and for the purposes set forth.

' Signed by me this 8th day of April, A. D. 1892. I I I 'WM. A. GRAY.

Witnesses:

Cleo. T; PINCKNEY, HAROLD SEBRELL. 

